Did they stop production of the old style focus months be for the new style came out? no! they ran test units down at the same time as the old ones went down and they probably had new style ones running down the line shortly after the old ones ran off the line so the same thing can happen for the euro style focus it's not that different than the current one to need major retooling.
The only thing I have read about the focus and a new plant is they will use the body shop at MTP to help ease the burden on Wayne.